Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)

Ted Lemon <mellon@fugue.com> Sat, 20 February 2021 14:42 UTC

Return-Path: <mellon@fugue.com>
X-Original-To: v6ops@ietfa.amsl.com
Delivered-To: v6ops@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 918E53A147C for <v6ops@ietfa.amsl.com>; Sat, 20 Feb 2021 06:42:58 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.898
X-Spam-Level:
X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=fugue-com.20150623.gappssmtp.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zjDqWDpuuru7 for <v6ops@ietfa.amsl.com>; Sat, 20 Feb 2021 06:42:57 -0800 (PST)
Received: from mail-qk1-x734.google.com (mail-qk1-x734.google.com [IPv6:2607:f8b0:4864:20::734]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E780C3A147B for <v6ops@ietf.org>; Sat, 20 Feb 2021 06:42:56 -0800 (PST)
Received: by mail-qk1-x734.google.com with SMTP id m144so8440779qke.10 for <v6ops@ietf.org>; Sat, 20 Feb 2021 06:42:56 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=MfaGyI3R0KLRCFfCJobVHkFICEHbZzNysbxbO/c3duo=; b=FVf5XD8uppA29sxcI7CFhHX5uedJQehIfy29RsMjXPK3GmnCrJNArmTHQJs49fiTRD 8ihyuHOz5L2oVAjd9xdg4jvUpOeDRXvlxRsdN6YEdZsHEKU3JHaJMqLiyJbP4g/KyWAK bjE9KmcJPJ32XTKCV9mU3ATiKJe0rG4k8nf4jfmi1f6yGa51zv9Iho05biGogLIZ939h KH2gDAcXAVCNNBxgAnaWwvT9BklxCDFBXvEx6Wwt2qZ/zwXVUSDKBuweUh8QmaK3eNGt 9tpnRMj0z9XvchJa02j/paLmddf/WLMMAO2RodB4yfepoMeQPKo8gLpp0wFIPuuzgttP zn0Q==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=MfaGyI3R0KLRCFfCJobVHkFICEHbZzNysbxbO/c3duo=; b=NF/8dcqlQTM8Q193ECiNqf+MHbStGaC3SWmqPYB6ZbKoy0VaySyc9g3yWi068QUVHo wgUQ2b6b9dbiLdLLAYtSUoVbteS3hJ74UvMOd5uKUyqXlsBgqtLAebVtCfxrWpJBcKTr vh2EG4lLoJ8Cmtmh0yymMhyEmn7WJcLyuOKFuIHIR4R2DWjo8T4YvV17k8cMZK5XI8F2 7iT4i0Leh9Uk1inXLzG3Q8RfCCglLsWEu9yNOZA47M5OH0q72VQ0mucpVE4Cl5q884OZ l80lR168akHcd8qV11qOPePLi7AsCB7vStyzblwuHJjZVoczvDC75k1fCSd/Hu204W3i nZ5w==
X-Gm-Message-State: AOAM5303MhwUTDgWgAoLF/6ozndiq5slklgLoM/CCs2MdQed3us/Daet P5Ip1I5wFNg0NFLDENiPjMCGnsO40Q/3TQ==
X-Google-Smtp-Source: ABdhPJxmyDFMAYOYONvZdKMRwT26Se/23/dDZMPpX6vEg0Yio6g6gR43uf/mm7b7uKs1+JaVto/cXg==
X-Received: by 2002:a37:aa4b:: with SMTP id t72mr14216923qke.365.1613832175768; Sat, 20 Feb 2021 06:42:55 -0800 (PST)
Received: from smtpclient.apple (c-24-91-177-160.hsd1.ma.comcast.net. [24.91.177.160]) by smtp.gmail.com with ESMTPSA id p10sm8633707qke.92.2021.02.20.06.42.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 20 Feb 2021 06:42:55 -0800 (PST)
From: Ted Lemon <mellon@fugue.com>
Message-Id: <18D5AD31-3758-40DF-A168-2E3AAE889E05@fugue.com>
Content-Type: multipart/alternative; boundary="Apple-Mail=_CF7D1909-BEEB-4AFC-A120-5BA518F8FD4B"
Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.80.0.2.33\))
Date: Sat, 20 Feb 2021 09:42:54 -0500
In-Reply-To: <YDEX/Uu9X2hm+RX/@Space.Net>
Cc: Fernando Gont <fgont@si6networks.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
To: Gert Doering <gert@space.net>
References: <a5b9b8566ce446d3a5e5dcc9ca2fbac2@boeing.com> <CAN-Dau1xD21EpqrSXKHLzADPyjeWcwc=phHGSFP8cj6705O2BQ@mail.gmail.com> <5f0f480a-b331-7f0c-a738-5d80bd8569e6@si6networks.com> <02dd48fbe6cc44c482662fdc1978219f@boeing.com> <4908665c-94cf-810f-8bff-7407e3abe099@si6networks.com> <c09cfe42-f74b-ccaf-f03b-fb6942ed890f@gmail.com> <061050f0-6034-d11c-1898-24bc8461aed9@si6networks.com> <YDEX/Uu9X2hm+RX/@Space.Net>
X-Mailer: Apple Mail (2.3654.80.0.2.33)
Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/oYlgCHxqR1W8npwBsbyObodGO2o>
Subject: Re: [v6ops] Scope of Unique Local IPv6 Unicast Addresses (Fwd: New Version Notification for draft-gont-6man-ipv6-ula-scope-00.txt)
X-BeenThere: v6ops@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: v6ops discussion list <v6ops.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/v6ops>, <mailto:v6ops-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/v6ops/>
List-Post: <mailto:v6ops@ietf.org>
List-Help: <mailto:v6ops-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/v6ops>, <mailto:v6ops-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sat, 20 Feb 2021 14:42:59 -0000

On Feb 20, 2021, at 9:09 AM, Gert Doering <gert@space.net> wrote:
> In practice, how much IPv6 multicast is there which is not "node" and
> "link" scoped?  Or, to be even more picky, not "link" scoped?

It’s being used in the context of IoT to do mass events, like turning on all the lights in a context where the switch is on link A, and some lights are on links B and C, for example. The motivation for doing this is that in principle multicast uses less of the constrained bandwidth of the IoT network. This can work because even when this sort of partition happens, there is a common infrastructure backbone that can handle the multicast routing issues. The old dream of multicast video on the internet seems to be dead, but that doesn’t mean that off-link multicast is never useful.